//==============================================================================
//	
//	Copyright (c) 2002-
//	Authors:
//	* Dave Parker <david.parker@comlab.ox.ac.uk> (University of Oxford)
//	
//------------------------------------------------------------------------------
//	
//	This file is part of PRISM.
//	
//	PRISM is free software; you can redistribute it and/or modify
//	it under the terms of the GNU General Public License as published by
//	the Free Software Foundation; either version 2 of the License, or
//	(at your option) any later version.
//	
//	PRISM is distributed in the hope that it will be useful,
//	but WITHOUT ANY WARRANTY; without even the implied warranty of
//	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//	GNU General Public License for more details.
//	
//	You should have received a copy of the GNU General Public License
//	along with PRISM; if not, write to the Free Software Foundation,
//	Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//	
//==============================================================================

package com.prism.e4.rcp.parser.type;

import com.prism.e4.rcp.prism.PrismLangException;

public class TypeDouble extends Type {

	private static TypeDouble singleton;

	static {
		singleton = new TypeDouble();
	}

	private TypeDouble() {
	}

	public boolean equals(Object o) {
		return (o instanceof TypeDouble);
	}

	@Override
	public String getTypeString() {
		return "double";
	}

	@Override
	public Object defaultValue() {
		return new Double(0.0);
	}

	public static TypeDouble getInstance() {
		return singleton;
	}

	@Override
	public boolean canAssign(Type type) {
		return (type instanceof TypeDouble || type instanceof TypeInt);
	}

	@Override
	public Double castValueTo(Object value) throws PrismLangException {
		if (value instanceof Double)
			return (Double) value;
		if (value instanceof Integer)
			return new Double(((Integer) value).intValue());
		else
			throw new PrismLangException("Can't convert " + value.getClass()
					+ " to type " + getTypeString());
	}
}

// ------------------------------------------------------------------------------
